SMB110
Preliminary Information
Five Channel Programmable DC-DC System Power Manager
FEATURES & APPLICATIONS
•
Digital programming of all major parameters via I
2
C
interface and non-volatile memory
o
Output voltage set point
o
Output power-up/down sequencing
o
Input/Battery voltage monitoring
o
Digital soft-start and output slew rate
o
Output voltage margining
o
UV/OV monitoring of all outputs
o
Enable/Disable outputs independently
•
Five output channels
o
Two synchronous step-down (buck) channels
o
One step-up (boost) channel
o
One inverting (buck-boost) channel
o
One fixed output +3.3V LDO
INTRODUCTION
The SMB110 is a highly integrated and flexible five-channel
power manager designed for use in a wide range of portable
applications. The built-in digital programmability allows system
designers to custom tailor the device to suit almost any multi-
channel power supply application from digital camcorders to
mobile phones. Complete with a user friendly GUI, all
programmable settings including output voltages and
input/output voltage monitoring can be customized with ease.
The SMB110 integrates all the essential blocks required to
implement a complete five-channel power subsystem including
two synchronous step-down “buck” controllers, one step-up
“boost” controller, one inverting “buck-boost” controller and one
fixed output +3.3V LDO. Additionally sophisticated power
control/monitoring functions required by complex systems are
built-in. These include digitally programmable output voltage
set point, power-up/down sequencing, enable/disable,
margining and UV/OV/input/output monitoring on all channels.
The integration of features and built-in flexibility of the SMB110
allows the system designer to create a “platform solution” that
can be easily modified via software without major hardware
changes.
Combined with the re-programmability of the
SMB110 this facilitates rapid design cycles and proliferation
from a base design to future generations of product.
The SMB110 is suited to battery-powered applications with an
input range of +2.7V to +6.0V. Output voltages are extremely
accurate (<0.5%) employing proprietary ADOC™ technology.
Communication is via the industry standard I
2
C bus. All user-
programmed settings are stored in non-volatile EEPROM of
which 96 bytes may be used for general-purpose memory
applications. The operating temperature range is +0C to +70C
and the available package is a lead-free, Green, RoHS
compliant, 32-pad QFN-32.
•
User friendly Graphical User Interface (GUI)
•
+2.7V to +6.0V Input Range
•
Highly accurate reference and output voltage (<0.5%)
with Active DC Output Control (ADOC™) technology
•
Undervoltage Lockout (UVLO) with hysteresis
•
800 kHz operating frequency
•
96 bytes of user configurable nonvolatile memory
Applications
•
•
•
•
•
•
Digital camcorders/still cameras
Portable DVD/MP3/GPS
Camera/smart phones
TFT Displays/Monitors/TV’s
Mobile Computing/PDA’s
Consumer battery-operated equipment
SIMPLIFIED APPLICATIONS DRAWING
SMB110
+2.7V to +6.0V
or
Li-Ion
LDO
Inverter
Channel
Step-Up
(Boost)
Channels
System
Control and
Monitoring
+3.3V @20mA
MCU/RTC
-0.8V to -30V (Prog.) @UP TO1A
CCD
I2C/SMBus
Vin to +30V (Prog.) @ UP TO 1A
TFT/LCD
Reset Input
Reset Output
Power Good
+0.8V to 0.9 x Vin (Prog.) @ 2A
2 Step-
Down
(Buck)
Channels
Memory, I/O
+0.8V to 0.9 x Vin (Prog.) @ 2A
CPU Core
Figure 1 – Applications diagram featuring the SMB110 five-channel, programmable DC-DC controller
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT
Microelectronics, Inc. 2005
1717 Fox Drive • San Jose CA 95131 •
Phone 408 436-9890 • FAX 408 436-9897
http://www.summitmicro.com/
2099 2.3
5/3/2005
1
SMB110
Preliminary Information
TABLE OF CONTENTS
General Description ........................................................ 3
Typical Application .......................................................... 4
Internal Block Diagram.................................................... 5
Pin Descriptions ...........................................................6-8
Package and Pin Configuration ...................................... 9
Absolute Maximum Ratings .......................................... 10
Recommended Operating Conditions........................... 10
DC Operating Characteristics ..................................10-13
AC Operating Characteristics .................................14-15
I
2
C 2-Wire Serial Interface AC Operating Characteristics-
100khz........................................................................... 16
Timing Diagrams: I
2
C.................................................... 16
Efficiency Graphs.......................................................... 17
Transient Response...................................................... 18
Timing Diagrams: Power-On Sequence ....................... 19
Applications Information: Device Operation
Power Supply................................................................ 20
Enable ........................................................................... 20
Power-On Sequencing.................................................. 20
Normal Sequencing ...................................................... 20
Sequencing With Enable............................................... 20
Sequencing with channel bypass ................................. 21
Manual Mode ................................................................ 21
Monitoring ..................................................................... 21
Output Voltage .............................................................. 21
LDO Standby Voltage ................................................... 22
Soft Start ....................................................................... 22
Power-On Sequencing FlowChart ................................ 23
Minimum Load .............................................................. 24
Margining ...................................................................... 24
Application Schematic................................................... 25
Bill of materials.........................................................26-27
Programming information
Development Hardware & Software ............................. 28
Serial Interface.............................................................. 29
Write.............................................................................. 29
Read.............................................................................. 29
Configuration Registers ................................................ 29
General Purpose Memory............................................. 29
GUI................................................................................ 30
I
2
C memory read and writes ......................................... 31
Default Configuration Register Setting
.....................
32
Part Marking.................................................................. 33
Package ........................................................................ 34
Ordering Information ..................................................... 35
Legal Notice .................................................................. 35
Summit Microelectronics, Inc
2099 2.3 5/3/2005
2
SMB110
Preliminary Information
GENERAL DESCRIPTION
The SMB110 is a fully programmable DC-DC controller
that monitors, margins, and cascade sequences. It has 5
voltage outputs, consisting of: two synchronous “buck”
step-down controllers, one “boost” step-up controller,
one “boost-buck” negative DC-DC controller, and one
LDO.
The SMB110 uses a fixed 800 kHz Pulse Width
Modulation (PWM) control circuit. A type three voltage
mode compensation network is used offering a cost
effective solution without compromising the transient
response. By utilizing external n and p–type MOSFET
transistors the efficiency and load current can be
customized to fit a wide array of system requirements.
The SMB110 integrates two buck outputs that are
capable of producing an output voltage less than the
input voltage. Each buck output voltage is set by an
internal resistor divider and a programmable voltage
reference. The integrated resistor divider eliminates the
cost and space necessary for external components and
has several programmable values. Through the
programmability of the reference and the resistor divider,
practically any output voltage less than the battery can
be produced without the need to change external
components.
In addition, the SMB110 integrates one boost output
capable of producing an output voltage greater than the
input voltage. The boost topology is asynchronous, using
a rectifying Schottky diode and eliminating the need for
an additional external MOSFET driver. An external p-
channel sequencing MOSFET’s accompanies the boost
channel in order to isolate the switching MOSFET from
the battery when disabled.
The SMB110 also contains one inverting buck-boost
output capable of producing a negative output voltage
less than or greater than, the input voltage. The buck
boost output is asynchronous and drives an external p-
channel MOSFET.
A Low DropOut linear regulator with fixed 3.3 volt output
provides a low current supply for “always on”
microcontrollers. The LDO has a special input supply
that is internally multiplexed between the LDO supply pin
and the battery. This ensures that the LDO will always
be active over the recommended operating voltages
(2.7V – 6.0V).
The SMB110 is capable of power-on/off cascade
sequencing where each channel can be assigned one of
four unique sequence positions. During sequencing each
channel in a given sequence position is guaranteed to
reach its programmed output voltage before the
channel(s) occupying the next sequence position initiate
their respective soft-start sequence. A unique
programmable delay exists between each power on/off
sequence position. In addition to power on/off
sequencing all supplies can be powered on/off
individually through an I
2
C command or by assertion of
an enable pin.
Each output voltage is monitored for under-voltage and
over-voltage (UV/OV) conditions, using a comparator-
based circuit where the output voltage is compared
against an internal programmable reference. An
additional feature of the output voltage monitoring is a
programmable glitch filter capable of digitally filtering a
transient OV/UV fault condition from a true system error.
When a fault is detected for a period in excess of the
glitch filter, all supplies may be sequenced down or
immediately disabled and one of two output status pins
can be asserted. The current system status is always
accessible via internal registers containing the status of
all four channels.
The SMB110 possesses an Undervoltage Lockout
(UVLO) circuit to ensure the SMB110 will not power up
until the battery voltage has reached a safe operating
voltage. The UVLO function exhibits hysteresis, ensuring
that noise or a brown out voltage on the supply rail does
not inadvertently lead to a system failure.
The SMB110 provides margining control over all of its
output voltages. Through an I
2
C command, all outputs
can be margined to any voltage setting within the
nominal output voltage rage. Margining creates three
pre-programmed settings that each channel can be set
to via an I
2
C command. Margining is ideal when used
with the boost channel configured as an LED driver
where margining provides three brightness settings.
In addition, each output is slew rate limited by soft-start
circuitry that is user programmable and requires no
external capacitors.
All programmable settings on the SMB110 are stored in
non-volatile registers and are easily accessed and
modified over an industry standard I
2
C serial bus. For
fastest prototype development times Summit offers an
evaluation card and a Graphical User Interface (GUI).
Summit Microelectronics, Inc
2099 2.3 5/3/2005
3
SMB110
Preliminary Information
TYPICAL APPLICATION
+2.7 to +6.0V
SMB110
VBATT
VDDCAP
GND
DRVGND
HSDRV_CH3
+0.8V to 0.9 x VIN @ 2A
HVSUP3
LSDRV_CH3
SDA
SCL
nRESET
HEALTHY
PWREN0
HOST_RESET
HVSUP2
VM_CH3
COMP1_CH3
COMP2_CH3
HSDRV_CH2
-0.8V to -10 x VIN @ UP TO 1A
LSDRV_CH0
COMP1_CH0
COMP2_CH0 LSDRV_CH2
+0.8V to 0.9 x VIN @ 2A
VM_CH2
COMP1_CH2
VREFOUT
COMP2_CH2
PCHSEQ_CH1
3.3V @ 20mA
VSTANDBY
LDO_SUPPLY
LSDRV_CH1
COMP1_CH1
COMP2_CH1
1.1 x VIN to 10 xVIN @ UP TO 1A
Figure 2 – Typical application schematic showing external circuitry necessary to configure the SMB110
channels as: step-up, step-down, and inverting outputs
Summit Microelectronics, Inc
2099 2.3 3/1/2005
4
SMB110
Preliminary Information
INTERNAL BLOCK DIAGRAM
COMP2_CH[2,3]
VM_CH[2,3]
100k
–
+
OA
+
–
CLAMP
DUTY
CYCLE
LIMIT
HVSUP[2,3]
Channel 2 and 3
Synchronous buck
PWM Converter
HSDRV[2,3]
MAX LIMIT
OSC
Fixed 800kHz LOW LIMIT
DEADTIME
COMP1_CH[2,3]
VREF
LEVEL
SHIFTER
DIGITAL TO
ANALOG
CONVERTER
VREF
+
–
GLITCH
FILTER
OVER VOLTAGE
DETECTION
LSDRV[2,3]
+
–
GLITCH
FILTER
UNDER VOLTAGE
DETECTION
SEQUENCING
LOGIC
ENABLE
ENABLE
ENABLE
PWREN0
COMP2_CH1
–
+
+
OA
+
–
CLAMP
DUTY
CYCLE
LIMIT
Channel 1
boost
PWM Converter
with Shutoff
VDD_CAP
MAX LIMIT
OSC
Fixed 800kHz LOW LIMIT
COMP
+
–
100u
PCHSEQ_CH1
LSDRV1
DRIVER
COMP1_CH1
+
–
LEVEL
SHIFTER
+
GLITCH
FILTER
OVER VOLTAGE
DETECTION
0.2 V
I
2
C/SMBUS
SDA
SCL
VREF
–
GLITCH
FILTER
UNDER VOLTAGE
DETECTION
Channel 0
Negative
PWM Converter
DRIVER
–
+
OA
+
–
CLAMP
DUTY
CYCLE
LIMIT
LSDRV0
MAX LIMIT
OSC
Fixed 800kHz LOW LIMIT
COMP1_CH0
COMP2_CH0
VREF_OUT
–
+
LEVEL
SHIFTER
VREF
–
+
GLITCH
FILTER
OVER VOLTAGE
DETECTION
LEVEL
SHIFTER
X2
GLITCH
FILTER
UNDER VOLTAGE
DETECTION
VREF
LDO_SUPPLY
VBATT
Standby Series-Pass LDO
LDO
BANDGAP
VREF
nBATT_FAULT
Channel 5
VCC_ALL
VSTANDBY
VDD_CAP
2.5V
REGULATOR
+
–
GND
UV2
D
Q
LEVEL
SHIFTER
+
–
UV1
Summit Microelectronics, Inc
2099 2.3 3/1/2005
5
嵌入式系统
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